A216650 - cp's OEIS frontend

A216650 Maximum length of each subsequence whose elements are the greatest prime divisors of the integers 2, 3, 4, ... in increasing order.

n	a(n)
1	2
2	2
3	2
4	4
5	2
6	1
7	1
8	2
9	2
10	4
11	3
12	3
13	2
14	3
15	1
16	2
17	1
18	1
19	2
20	2
21	1
22	3
23	2
24	2
25	2
26	2
27	4
28	2
29	1
30	1
31	2
32	2
33	2
34	2
35	2
36	1
37	2
38	3
39	1
40	3
41	3
42	1
43	2
44	5
45	1
46	2
47	2
48	2
49	2
50	1
51	3
52	2
53	2
54	2
55	3
56	2
57	1
58	3
59	1
60	1
61	3
62	2
63	2
64	3
65	3
66	2
67	3
68	1
69	3
70	3
71	2
72	1
73	1
74	2
75	2
76	1
77	1
78	2
79	2
80	1
81	3
82	6
83	1
84	5
85	2
86	2
87	2

[2, 2, 2, 4, 2, 1, 1, 2, 2, 4, 3, 3, 2, 3, 1, 2, 1, 1, 2, 2, 1, 3, 2, 2, 2, 2, 4, 2, 1, 1, 2, 2, 2, 2, 2, 1, 2, 3, 1, 3, 3, 1, 2, 5, 1, 2, 2, 2, 2, 1, 3, 2, 2, 2, 3, 2, 1, 3, 1, 1, 3, 2, 2, 3, 3, 2, 3, 1, 3, 3, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 3, 6, 1, 5, 2, 2, 2]

cp's OEIS Frontend

A216650 Maximum length of each subsequence whose elements are the greatest prime divisors of the integers 2, 3, 4, ... in increasing order.

Table of values

List of values

n	a(n)
1	2
2	2
3	2
4	4
5	2
6	1
7	1
8	2
9	2
10	4
11	3
12	3
13	2
14	3
15	1
16	2
17	1
18	1
19	2
20	2
21	1
22	3
23	2
24	2
25	2
26	2
27	4
28	2
29	1
30	1
31	2
32	2
33	2
34	2
35	2
36	1
37	2
38	3
39	1
40	3
41	3
42	1
43	2
44	5
45	1
46	2
47	2
48	2
49	2
50	1
51	3
52	2
53	2
54	2
55	3
56	2
57	1
58	3
59	1
60	1
61	3
62	2
63	2
64	3
65	3
66	2
67	3
68	1
69	3
70	3
71	2
72	1
73	1
74	2
75	2
76	1
77	1
78	2
79	2
80	1
81	3
82	6
83	1
84	5
85	2
86	2
87	2

n	a(n)
1	2
2	2
3	2
4	4
5	2
6	1
7	1
8	2
9	2
10	4
11	3
12	3
13	2
14	3
15	1
16	2
17	1
18	1
19	2
20	2
21	1
22	3
23	2
24	2
25	2
26	2
27	4
28	2
29	1
30	1
31	2
32	2
33	2
34	2
35	2
36	1
37	2
38	3
39	1
40	3
41	3
42	1
43	2
44	5
45	1
46	2
47	2
48	2
49	2
50	1
51	3
52	2
53	2
54	2
55	3
56	2
57	1
58	3
59	1
60	1
61	3
62	2
63	2
64	3
65	3
66	2
67	3
68	1
69	3
70	3
71	2
72	1
73	1
74	2
75	2
76	1
77	1
78	2
79	2
80	1
81	3
82	6
83	1
84	5
85	2
86	2
87	2

n	a(n)
1	2
2	2
3	2
4	4
5	2
6	1
7	1
8	2
9	2
10	4
11	3
12	3
13	2
14	3
15	1
16	2
17	1
18	1
19	2
20	2
21	1
22	3
23	2
24	2
25	2
26	2
27	4
28	2
29	1
30	1
31	2
32	2
33	2
34	2
35	2
36	1
37	2
38	3
39	1
40	3
41	3
42	1
43	2
44	5
45	1
46	2
47	2
48	2
49	2
50	1
51	3
52	2
53	2
54	2
55	3
56	2
57	1
58	3
59	1
60	1
61	3
62	2
63	2
64	3
65	3
66	2
67	3
68	1
69	3
70	3
71	2
72	1
73	1
74	2
75	2
76	1
77	1
78	2
79	2
80	1
81	3
82	6
83	1
84	5
85	2
86	2
87	2